In vivo glenohumeral contact forces -: Measurements in the first patient 7 months postoperatively
In vivo glenohumeral contact forces -: Measurements in the first patient 7 months postoperatively
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DOI：
10.1016/j.jbiomech.2006.10.037
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发表时间：
2007-01-01
影响因子：
2.4
通讯作者：
Westerhoff, P.
中科院分区：
文献类型：
--
作者：
Bergmann, G.;Graichen, F.;Westerhoff, P.
了解盂肱关节的受力情况对于了解正常和病理性肩关节功能至关重要。它是进行骨折治疗或关节置换手术、优化植入物设计和固定以及改进和验证肩关节分析生物力学模型的基础。开发了一种具有遥测数据传输功能的肩关节植入物，用于测量关节接触力和力矩的六个分量。1例肱骨头关节病患者，植入后关节功能良好，术后前7个月，大多数日常活动的贴靠力均低于100%BW（体重百分比）。对于接近运动极限的手臂位置或对抗外部阻力时，其范围高达130% BW。当患者试图以最大的努力转动受阻的方向盘时，力上升到约150%BW，这是迄今为止观察到的最高水平。最感兴趣的是相对于肱骨的力方向，特别是矢状面上的力方向，这些力方向不受运动类型、手臂位置或外部阻力的影响。由于接头中的摩擦而产生的力矩达到5.2 N m。摩擦引起的接触力相对于植入物股骨头中心的位移范围高达6.3 mm。这些首次在全球范围内对盂肱关节接触力进行的体内测量正在更多患者中继续进行，并持续更长的术后时间。(c)2006爱思唯尔有限公司保留所有权利。
Knowledge of forces in the glenohumeral joint is essential for understanding normal and pathologic shoulder function. It forms the basis for performing fracture treatment or joint replacement surgery, for optimizing implant design and fixation and for improving and verifying analytical biomechanical models of the shoulder. An instrumented shoulder implant with telemetric data transmission was developed to measure six components of joint contact forces and moments. A patient with humeral head arthrosis achieved good joint function after its implantation.During the first 7 postoperative months, the contact force remained below 100% BW (percent body weight) for most activities of daily living. It ranged up to 130% BW for arm positions close to the limits of motion or when acting against external resistance. When the patient tried to turn a blocked steering wheel with maximum effort, the force rose to about 150% BW, the highest level observed thus far. Of great interest were the force directions relative to the humerus, especially those in the sagittal plane, which were not greatly influenced by the type of exercise, the arm position or the external resistance. The moments due to friction in the joint reached 5.2 N m. The friction-induced shift of contact forces relative to the implant head centre ranged up to 6.3 mm. These first worldwide in vivo measurements of glenohumeral contact forces are being continued in more patients and for longer postoperative times. (c) 2006 Elsevier Ltd. All rights reserved.